tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#ifndef _RDS_IB_H
2#define _RDS_IB_H
3
4#include <rdma/ib_verbs.h>
5#include <rdma/rdma_cm.h>
6#include "rds.h"
7#include "rdma_transport.h"
8
9#define RDS_FMR_SIZE 256
10#define RDS_FMR_POOL_SIZE 4096
11
12#define RDS_IB_MAX_SGE 8
13#define RDS_IB_RECV_SGE 2
14
15#define RDS_IB_DEFAULT_RECV_WR 1024
16#define RDS_IB_DEFAULT_SEND_WR 256
17
18#define RDS_IB_SUPPORTED_PROTOCOLS 0x00000003 /* minor versions supported */
19
20extern struct list_head rds_ib_devices;
21
22/*
23 * IB posts RDS_FRAG_SIZE fragments of pages to the receive queues to
24 * try and minimize the amount of memory tied up both the device and
25 * socket receive queues.
26 */
27/* page offset of the final full frag that fits in the page */
28#define RDS_PAGE_LAST_OFF (((PAGE_SIZE / RDS_FRAG_SIZE) - 1) * RDS_FRAG_SIZE)
29struct rds_page_frag {
30 struct list_head f_item;
31 struct page *f_page;
32 unsigned long f_offset;
33 dma_addr_t f_mapped;
34};
35
36struct rds_ib_incoming {
37 struct list_head ii_frags;
38 struct rds_incoming ii_inc;
39};
40
41struct rds_ib_connect_private {
42 /* Add new fields at the end, and don't permute existing fields. */
43 __be32 dp_saddr;
44 __be32 dp_daddr;
45 u8 dp_protocol_major;
46 u8 dp_protocol_minor;
47 __be16 dp_protocol_minor_mask; /* bitmask */
48 __be32 dp_reserved1;
49 __be64 dp_ack_seq;
50 __be32 dp_credit; /* non-zero enables flow ctl */
51};
52
53struct rds_ib_send_work {
54 struct rds_message *s_rm;
55 struct rds_rdma_op *s_op;
56 struct ib_send_wr s_wr;
57 struct ib_sge s_sge[RDS_IB_MAX_SGE];
58 unsigned long s_queued;
59};
60
61struct rds_ib_recv_work {
62 struct rds_ib_incoming *r_ibinc;
63 struct rds_page_frag *r_frag;
64 struct ib_recv_wr r_wr;
65 struct ib_sge r_sge[2];
66};
67
68struct rds_ib_work_ring {
69 u32 w_nr;
70 u32 w_alloc_ptr;
71 u32 w_alloc_ctr;
72 u32 w_free_ptr;
73 atomic_t w_free_ctr;
74};
75
76struct rds_ib_device;
77
78struct rds_ib_connection {
79
80 struct list_head ib_node;
81 struct rds_ib_device *rds_ibdev;
82 struct rds_connection *conn;
83
84 /* alphabet soup, IBTA style */
85 struct rdma_cm_id *i_cm_id;
86 struct ib_pd *i_pd;
87 struct ib_mr *i_mr;
88 struct ib_cq *i_send_cq;
89 struct ib_cq *i_recv_cq;
90
91 /* tx */
92 struct rds_ib_work_ring i_send_ring;
93 struct rds_message *i_rm;
94 struct rds_header *i_send_hdrs;
95 u64 i_send_hdrs_dma;
96 struct rds_ib_send_work *i_sends;
97
98 /* rx */
99 struct mutex i_recv_mutex;
100 struct rds_ib_work_ring i_recv_ring;
101 struct rds_ib_incoming *i_ibinc;
102 u32 i_recv_data_rem;
103 struct rds_header *i_recv_hdrs;
104 u64 i_recv_hdrs_dma;
105 struct rds_ib_recv_work *i_recvs;
106 struct rds_page_frag i_frag;
107 u64 i_ack_recv; /* last ACK received */
108
109 /* sending acks */
110 unsigned long i_ack_flags;
111#ifdef KERNEL_HAS_ATOMIC64
112 atomic64_t i_ack_next; /* next ACK to send */
113#else
114 spinlock_t i_ack_lock; /* protect i_ack_next */
115 u64 i_ack_next; /* next ACK to send */
116#endif
117 struct rds_header *i_ack;
118 struct ib_send_wr i_ack_wr;
119 struct ib_sge i_ack_sge;
120 u64 i_ack_dma;
121 unsigned long i_ack_queued;
122
123 /* Flow control related information
124 *
125 * Our algorithm uses a pair variables that we need to access
126 * atomically - one for the send credits, and one posted
127 * recv credits we need to transfer to remote.
128 * Rather than protect them using a slow spinlock, we put both into
129 * a single atomic_t and update it using cmpxchg
130 */
131 atomic_t i_credits;
132
133 /* Protocol version specific information */
134 unsigned int i_flowctl:1; /* enable/disable flow ctl */
135
136 /* Batched completions */
137 unsigned int i_unsignaled_wrs;
138 long i_unsignaled_bytes;
139};
140
141/* This assumes that atomic_t is at least 32 bits */
142#define IB_GET_SEND_CREDITS(v) ((v) & 0xffff)
143#define IB_GET_POST_CREDITS(v) ((v) >> 16)
144#define IB_SET_SEND_CREDITS(v) ((v) & 0xffff)
145#define IB_SET_POST_CREDITS(v) ((v) << 16)
146
147struct rds_ib_ipaddr {
148 struct list_head list;
149 __be32 ipaddr;
150};
151
152struct rds_ib_device {
153 struct list_head list;
154 struct list_head ipaddr_list;
155 struct list_head conn_list;
156 struct ib_device *dev;
157 struct ib_pd *pd;
158 struct ib_mr *mr;
159 struct rds_ib_mr_pool *mr_pool;
160 int fmr_page_shift;
161 int fmr_page_size;
162 u64 fmr_page_mask;
163 unsigned int fmr_max_remaps;
164 unsigned int max_fmrs;
165 int max_sge;
166 unsigned int max_wrs;
167 spinlock_t spinlock; /* protect the above */
168};
169
170/* bits for i_ack_flags */
171#define IB_ACK_IN_FLIGHT 0
172#define IB_ACK_REQUESTED 1
173
174/* Magic WR_ID for ACKs */
175#define RDS_IB_ACK_WR_ID (~(u64) 0)
176
177struct rds_ib_statistics {
178 uint64_t s_ib_connect_raced;
179 uint64_t s_ib_listen_closed_stale;
180 uint64_t s_ib_tx_cq_call;
181 uint64_t s_ib_tx_cq_event;
182 uint64_t s_ib_tx_ring_full;
183 uint64_t s_ib_tx_throttle;
184 uint64_t s_ib_tx_sg_mapping_failure;
185 uint64_t s_ib_tx_stalled;
186 uint64_t s_ib_tx_credit_updates;
187 uint64_t s_ib_rx_cq_call;
188 uint64_t s_ib_rx_cq_event;
189 uint64_t s_ib_rx_ring_empty;
190 uint64_t s_ib_rx_refill_from_cq;
191 uint64_t s_ib_rx_refill_from_thread;
192 uint64_t s_ib_rx_alloc_limit;
193 uint64_t s_ib_rx_credit_updates;
194 uint64_t s_ib_ack_sent;
195 uint64_t s_ib_ack_send_failure;
196 uint64_t s_ib_ack_send_delayed;
197 uint64_t s_ib_ack_send_piggybacked;
198 uint64_t s_ib_ack_received;
199 uint64_t s_ib_rdma_mr_alloc;
200 uint64_t s_ib_rdma_mr_free;
201 uint64_t s_ib_rdma_mr_used;
202 uint64_t s_ib_rdma_mr_pool_flush;
203 uint64_t s_ib_rdma_mr_pool_wait;
204 uint64_t s_ib_rdma_mr_pool_depleted;
205};
206
207extern struct workqueue_struct *rds_ib_wq;
208
209/*
210 * Fake ib_dma_sync_sg_for_{cpu,device} as long as ib_verbs.h
211 * doesn't define it.
212 */
213static inline void rds_ib_dma_sync_sg_for_cpu(struct ib_device *dev,
214 struct scatterlist *sg, unsigned int sg_dma_len, int direction)
215{
216 unsigned int i;
217
218 for (i = 0; i < sg_dma_len; ++i) {
219 ib_dma_sync_single_for_cpu(dev,
220 ib_sg_dma_address(dev, &sg[i]),
221 ib_sg_dma_len(dev, &sg[i]),
222 direction);
223 }
224}
225#define ib_dma_sync_sg_for_cpu rds_ib_dma_sync_sg_for_cpu
226
227static inline void rds_ib_dma_sync_sg_for_device(struct ib_device *dev,
228 struct scatterlist *sg, unsigned int sg_dma_len, int direction)
229{
230 unsigned int i;
231
232 for (i = 0; i < sg_dma_len; ++i) {
233 ib_dma_sync_single_for_device(dev,
234 ib_sg_dma_address(dev, &sg[i]),
235 ib_sg_dma_len(dev, &sg[i]),
236 direction);
237 }
238}
239#define ib_dma_sync_sg_for_device rds_ib_dma_sync_sg_for_device
240
241
242/* ib.c */
243extern struct rds_transport rds_ib_transport;
244extern void rds_ib_add_one(struct ib_device *device);
245extern void rds_ib_remove_one(struct ib_device *device);
246extern struct ib_client rds_ib_client;
247
248extern unsigned int fmr_pool_size;
249extern unsigned int fmr_message_size;
250
251extern spinlock_t ib_nodev_conns_lock;
252extern struct list_head ib_nodev_conns;
253
254/* ib_cm.c */
255int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp);
256void rds_ib_conn_free(void *arg);
257int rds_ib_conn_connect(struct rds_connection *conn);
258void rds_ib_conn_shutdown(struct rds_connection *conn);
259void rds_ib_state_change(struct sock *sk);
260int __init rds_ib_listen_init(void);
261void rds_ib_listen_stop(void);
262void __rds_ib_conn_error(struct rds_connection *conn, const char *, ...);
263int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id,
264 struct rdma_cm_event *event);
265int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id);
266void rds_ib_cm_connect_complete(struct rds_connection *conn,
267 struct rdma_cm_event *event);
268
269
270#define rds_ib_conn_error(conn, fmt...) \
271 __rds_ib_conn_error(conn, KERN_WARNING "RDS/IB: " fmt)
272
273/* ib_rdma.c */
274int rds_ib_update_ipaddr(struct rds_ib_device *rds_ibdev, __be32 ipaddr);
275void rds_ib_add_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
276void rds_ib_remove_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
277void __rds_ib_destroy_conns(struct list_head *list, spinlock_t *list_lock);
278static inline void rds_ib_destroy_nodev_conns(void)
279{
280 __rds_ib_destroy_conns(&ib_nodev_conns, &ib_nodev_conns_lock);
281}
282static inline void rds_ib_destroy_conns(struct rds_ib_device *rds_ibdev)
283{
284 __rds_ib_destroy_conns(&rds_ibdev->conn_list, &rds_ibdev->spinlock);
285}
286struct rds_ib_mr_pool *rds_ib_create_mr_pool(struct rds_ib_device *);
287void rds_ib_get_mr_info(struct rds_ib_device *rds_ibdev, struct rds_info_rdma_connection *iinfo);
288void rds_ib_destroy_mr_pool(struct rds_ib_mr_pool *);
289void *rds_ib_get_mr(struct scatterlist *sg, unsigned long nents,
290 struct rds_sock *rs, u32 *key_ret);
291void rds_ib_sync_mr(void *trans_private, int dir);
292void rds_ib_free_mr(void *trans_private, int invalidate);
293void rds_ib_flush_mrs(void);
294
295/* ib_recv.c */
296int __init rds_ib_recv_init(void);
297void rds_ib_recv_exit(void);
298int rds_ib_recv(struct rds_connection *conn);
299int rds_ib_recv_refill(struct rds_connection *conn, gfp_t kptr_gfp,
300 gfp_t page_gfp, int prefill);
301void rds_ib_inc_purge(struct rds_incoming *inc);
302void rds_ib_inc_free(struct rds_incoming *inc);
303int rds_ib_inc_copy_to_user(struct rds_incoming *inc, struct iovec *iov,
304 size_t size);
305void rds_ib_recv_cq_comp_handler(struct ib_cq *cq, void *context);
306void rds_ib_recv_init_ring(struct rds_ib_connection *ic);
307void rds_ib_recv_clear_ring(struct rds_ib_connection *ic);
308void rds_ib_recv_init_ack(struct rds_ib_connection *ic);
309void rds_ib_attempt_ack(struct rds_ib_connection *ic);
310void rds_ib_ack_send_complete(struct rds_ib_connection *ic);
311u64 rds_ib_piggyb_ack(struct rds_ib_connection *ic);
312
313/* ib_ring.c */
314void rds_ib_ring_init(struct rds_ib_work_ring *ring, u32 nr);
315void rds_ib_ring_resize(struct rds_ib_work_ring *ring, u32 nr);
316u32 rds_ib_ring_alloc(struct rds_ib_work_ring *ring, u32 val, u32 *pos);
317void rds_ib_ring_free(struct rds_ib_work_ring *ring, u32 val);
318void rds_ib_ring_unalloc(struct rds_ib_work_ring *ring, u32 val);
319int rds_ib_ring_empty(struct rds_ib_work_ring *ring);
320int rds_ib_ring_low(struct rds_ib_work_ring *ring);
321u32 rds_ib_ring_oldest(struct rds_ib_work_ring *ring);
322u32 rds_ib_ring_completed(struct rds_ib_work_ring *ring, u32 wr_id, u32 oldest);
323extern wait_queue_head_t rds_ib_ring_empty_wait;
324
325/* ib_send.c */
326void rds_ib_xmit_complete(struct rds_connection *conn);
327int rds_ib_xmit(struct rds_connection *conn, struct rds_message *rm,
328 unsigned int hdr_off, unsigned int sg, unsigned int off);
329void rds_ib_send_cq_comp_handler(struct ib_cq *cq, void *context);
330void rds_ib_send_init_ring(struct rds_ib_connection *ic);
331void rds_ib_send_clear_ring(struct rds_ib_connection *ic);
332int rds_ib_xmit_rdma(struct rds_connection *conn, struct rds_rdma_op *op);
333void rds_ib_send_add_credits(struct rds_connection *conn, unsigned int credits);
334void rds_ib_advertise_credits(struct rds_connection *conn, unsigned int posted);
335int rds_ib_send_grab_credits(struct rds_ib_connection *ic, u32 wanted,
336 u32 *adv_credits, int need_posted, int max_posted);
337
338/* ib_stats.c */
339DECLARE_PER_CPU(struct rds_ib_statistics, rds_ib_stats);
340#define rds_ib_stats_inc(member) rds_stats_inc_which(rds_ib_stats, member)
341unsigned int rds_ib_stats_info_copy(struct rds_info_iterator *iter,
342 unsigned int avail);
343
344/* ib_sysctl.c */
345int __init rds_ib_sysctl_init(void);
346void rds_ib_sysctl_exit(void);
347extern unsigned long rds_ib_sysctl_max_send_wr;
348extern unsigned long rds_ib_sysctl_max_recv_wr;
349extern unsigned long rds_ib_sysctl_max_unsig_wrs;
350extern unsigned long rds_ib_sysctl_max_unsig_bytes;
351extern unsigned long rds_ib_sysctl_max_recv_allocation;
352extern unsigned int rds_ib_sysctl_flow_control;
353extern ctl_table rds_ib_sysctl_table[];
354
355/*
356 * Helper functions for getting/setting the header and data SGEs in
357 * RDS packets (not RDMA)
358 */
359static inline struct ib_sge *
360rds_ib_header_sge(struct rds_ib_connection *ic, struct ib_sge *sge)
361{
362 return &sge[0];
363}
364
365static inline struct ib_sge *
366rds_ib_data_sge(struct rds_ib_connection *ic, struct ib_sge *sge)
367{
368 return &sge[1];
369}
370
371#endif